[ibr-tdd-78] – The cac:CommodityClassification element MUST NOT contain elements other than cbc:ItemClassificationCode (BT-158).
ibr-tdd-78/pxs:TaxData/pxs:ReportedTransaction/pxs:ReportedDocument/pxs:DocumentLine/cac:Item/cac:CommodityClassificationcount(*[not(self::cbc:ItemClassificationCode)]) = 0